Improvement in tools for facing emery-wheels



Patented Oct 17 1876 T. A. nr-cmnns. TOOLS FOR FACING EMERY WHEELS.

m S y [I II a I M g m ITED STATE PATENT Qrrron THERON A. RICHARDS, OFBROOKLYN, NEW YORK, ASSIGNOR TO CHARLES H. WIGHT, TRUSTEE, OF SAMEPLACE.

IMPROVEMENT IN TOOLS FOR FACING EMERV-WHEELS.

Specification forming part of Letters Patent N 0. 183,469., datedOctober 17,1876; application filed December 23, 1874.

To all whom it may concern:

Be it known that I, THERON A. RICHARDS, of the city of Brooklyn, countyof Kings, and State of New York, have invented a new and usefulImprovement in Emery Wheel and Grinds'tone Facers, which improvement isfully set forth in the following specification, reference being bad tothe accompanying drawing.

The object of my invention is to true, trim, or face the worn or unevenfaces of emerywheels and grindstones, by means of the tool hereinafterdescribed, consisting of the two screw-thread-faced roller-cutters andthe bandle, in combination, as shown in Figure l of the accompanyingdrawin The handle of the tool consists in the usual shank of hand-tools,intended to receive the common wooden enlargement for the grasp of thehand, though it may be cast solid with the shank, jaws, and all, in onepiece; or the shank may be made of wood and the bracketjaw part ofmetal. v

The V-shaped notches are intended to receive a tool-rest as a fulcrum,by means of which pressure may be exerted upon the stone or emery-wheel.A V-shaped projection and corresponding rest, or any other similar andknown form of rest device for securing pressure, may be substitutedtherefor.

The cutting or facing device consists of a roller, R, which should be ofhard metal, (steel preferred,) and is provided with a continuouscutting-edge, disposed around the roller in the form of a spiral or ascrew-thread. 1 place two of these cutters, one with right and the otherwith left hand thread, on a small shaft, S, whereon they have free andindependent motion, and with the screw-threads of each cutter startingoutwardly, or in opposite directions, from the center between them, andrunning off at the outward end of the cutters. For the projecting endsof this shaft S bearings are provided in the jaws J J of the tool, whichare cut sufficiently deep to receive the roller-cutters, leaving theirfront faces projecting beyond the ends of the jaws J J, and free to actupon any opposing surface.

In practical use these roller-cutters are made to bear by leverage uponthe face of the revolving emery-wheel or grindstone wherever facing isrequired. The action of the revolving wheel or grindstone then causesrevolution of the cutters, which may be very rapid, since the facer maybe applied when they are at the full speed at which they are run ingrinding. The revolutions of the cutters, running with an equal facespeed, will therefore be very great, requiring that oil be kept on thebearing to prevent the setting of the cutters, and their consequentdestruction or injury by the emery-wheel or grindstone. Having made acut as deep as the cutters are intended to penetrate, by continuouspressing in one position, turning the tool over, and applying it in thesame place on the emerywheel, the cutting edges of the reversed threadedcutter will pass over and diagonally across the cutting of its fellowcutter, and make another cutting as deep as the previous one. The sameresult may be obtained by moving the cutter along, so as to present theface of the adjoining cutter to the previous work of its fellow ineither direction. Repetition of these operations at will accomplishesthe desired facing, even of the hardest emerywheels.

I do not herein claim the screw-thread, nor the right and left handscrew-thread, nor the diagonal cutters, as these form the subjectmatterof a separate application, filed August 12, 1876.

I claim as my invention- The tool for facing emery-wheels andgrindstones shown and described, consisting of the handle H, providedwith the jaws J J, and the roller-cutters R R, in combination, in themanner and for the purpose set forth.

THERON A. RICHARDS.

